Chapter 1 Safety Information and Precautions
Shenzhen Hpmont Technology Co., Ltd
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HD20 Series Inverters User Manual
By setting the skip frequency of the inverter (F05.17
－
F05.19) to avoid the load device or the
motor mechanical resonance point.
Check the insulation of the motor
For the first time using of the motor or after long time storage, it need check the insulation of the
motor to avoid damage the inverter because of the worse insulation motor.
Note:
Please use a 500V Mega-Ohm-Meter to test and the insulation resistance must be higher than
5Mohm.
Energy feedbacks to inverter
For the occasion to boost load and the like, negative torque often occurs. You should consider
setting proper parameters of the braking unit if the inverter is prone to overcurrent or overvoltage
fault trip.
1.3 Installation Limitation
No capacitor or varistor on the output side
Since the inverter output is PWM wave, it is strictly forbidden to connect capacitor for improving
the power factor or varistor for lightning protection to the output terminals so as to avoid the
inverter fault tripping or component damage.
Contactors and circuit breakers connected to the output of the inverter
If circuit breaker or contactor needs to be connected between the inverter and the motor, be sure
to operate these circuit breakers or contactor when the inverter has no output, so as to avoid any
damage to the inverter.
Rated voltage
The inverter is prohibited to be used beyond the specified range of operation voltage. If needed,
please use the suitable voltage regulation device to change the voltage.
Change three-phase input to single-phase input
For three-phase input inverter, the users should not change it to single-phase input.
If you have to use single-phase power supply, you should disable the input phase-loss protection
function. And the bus-voltage and current ripple will increase, which not only influences the life of
electrolytic capacitor but also deteriorates the performance of the inverter. In that case, the
inverter must be derating and should be within the inverter 60% rated value.
Lightning surge protection
The inverter internal design has lightning surge overcurrent protection circuit, and has certain
self-protection capacity against the lightning.
Altitude and derating